|
|
|
| Analysis of Temperature Effect of Box Girder under Solar Radiation in Dry Cold Region |
| SUN Wen，WU Ya - ping，JI Ri - chen |
| (Lanzhou Jiaotong University，Lanzhou，Gansu 730070，China) |
|
|
|
|
Abstract Research purposes： In the dry and cold regions of the west China，the cracking of concrete box girder bridge under the effect of temperature variation is very serious. In this paper，in order to analyze the influence of temperature stress on the concrete box girder bridge， the distribution of sunshine temperature difference of box bridge is given according to the characteristic of box bridge temperature boundary，and the box body temperature stress is considered as nonlinear temperature difference self - constraint stress along thickness and box body lateral restraint stress. In the western dry and cold areas of high temperature differential，under the effect of temperature changes the concrete box girder bridge on the outer surface will produce larger transverse temperature stress which will lead to the emergence of longitudinal cracks in the concrete deck and have great influence on the durability of the bridge，so this paper analyzes and studies the temperature effect under the influence of solar radiation in dry and cold regions， and puts forward measures to improve crack resistance of the girder body. Research conclusions: Temperature stress is composed of the nonlinear temperature self - restrained stress and external constraint stress. The calculation shows that ： (1) Under the action of temperature difference concrete box bridge will have a considerable temperature stress, which will cause the bridge concrete cracks. ( 2 ) The temperature gradient mode Along the plate thickness direction and the temperature difference between inside and outside is the key of temperature stress calculation under the action of temperature difference of bridge . There is a certain relationship between temperature stress and the plate thickness，and temperature stress will increase with the increase of the thickness. (3 ) The research result can provide a certain theoretical basis for the engineering construction in dry cold region of high temperature differential，and has the reference significance for the prevention and treatment of diseases and improving the structure durability.
|
|
Received: 05 September 2015
|
|
|
|
|
|
|
2016, Vol. 33 
